Magnetic separator



June 17 1924. 1,498,060

G. ULLRICH MAGNETIC SEPARATOR Filed March 18. 1921 New mm} WIIMIIIIIIIIIIIIIIIIIF F? Patented June 17, 1924.

warren stares GEORG ULLRICH, OF MA GDEBURG, GERMANY, ASSIGNOR TO FRIED. KRUI P AKTIEN- reatise PATENT OFFICE.

GESELLSGHAFT GRUSONW'EBK, OE MAGDEBU 'RG-BUCKAU, GERMANY.

MAGNETIC SEPARATOR.

Application filed March 18, 1921. Serial'ITo. 453,540.

T all whom it may concern v Be it known that I, Gnone ULLRIGH, a citizen of the German Empire, residing at Magdeburg, Germany, have invented certain new and useful Improvements in Magnetic Separators (for which I have filed application in Germany, July 11, 1919; Spain, June 4, 1920; Italy, June 16, 1920; Holland, June 16, 1920; England, June 18, 1920; Czechoslovakia, June 22, 1920; Portugal, June 30, 1920; Australia, July 10, 1920; France, June 30,1920; Sweden, March 22, 1919, Patent No. 47,788; and Norway, March 26, 1919, Patent No. 31,749), of which the following is a specification.

My invention relates to magnetic separators and more especially to separators of the revolving ring type. Its particular object is to increase the efiiciency and to lessen the cost of manufacture of such apparatus. In magnetic separators of the type aforesaid and particularly those having several magnetic separating zones, the use of sloping feed devices for conveying the raw material to the separator causes certain difficulties in the manufacture thereof. Thus the lower or stationary poles have to be bevelled and stepped to correspond to the stepped rings arranged above them, otherwise the stepped rings would be at a different distance from the lower poles at each point where the particular part of its operative edges is in the field. The stepped form of the lower poles also necessitates the feeding device being shaped to correspond thereto. This construction makes the manufacture of the separator considerably expensive and furthermore the poles when thus stepped are only suited to a single position of the feeding device. J

In order to adapt the lower poles to a number of various sloping positions of the feeding device it has been proposed to divide the lower poles into a number of pole pieces corresponding in number to the nu1nber of the rings in the revolving ring and to render them adjustable relatively to one another. If however the speed at which the material is fed to the separator is to be suited to the particular character of one sort of material and if the inclination of the feeding device be altered accordingly, a readjustment of all the zones is necessary, as the distance of the upper surface of the material from the pole pieces or rings forming the difierent zones changes with every change of position of the feeding device,

such readjustment necessitating the stopby the disadvantages stated above are overcome, such means consisting in an arrangement of the several parts of the separator so that the frame, the lower stationary poles,

the revolving annular magnet, and the feed mg device for the material can be tilted as a whole without any relative dlsplacemeut of the 'said parts taking place; in order therefore to alter the position of the feeding device for the material it is only necessary to slightly incline the frame of the sep arator, which operation can be carried out while the apparatus is working. Therings and the pole pieces do not require to be adjusted. The lower pole pieces do not need to be bevelled off when the feeding device is set obliquely and in consequence thereof the stepping of the lower pole pieces is not necessary either as they are at the same dis tance from the feeding device at every point of the particular part of their operative. edges which happens to be in the magnetic field. The tilting may be conveniently effected about the driving shaft of the separator, thereby preventing the driving belt or belts from being interfered with or their tension disturbed by the tilting of the frame. In order to enable the position of the devices for carrying away the magnetic material to be also altered during the tilting of the frame of the separator, they may be connected to the separator itself or to the device which supplies the raw material to and carries the non-magnetic material away from the apparatus in such a manner that they take part in the various inclinations of the separator.

In the drawings aflixed to this specification and forming part thereof two modifications of an apparatus embodying my invention are illustrated diagrammatically by way of example. In the drawings Fig. 1 is a side elevation, partly in section, of one modification, and

Fig. 2 is a plan of another modification.

Referring to the drawings, the magnetic frame 1 together with the lower poles 2', 3,

4, 5, the annular magnet 8 provided with 1 two knife edges 6, 7 and the shaking table 9 which feeds in the raw material are arranged so as to b capable of being tilted about the pin 10. In the example shown this pin 10 lies in the axis of the driving shaft 11 so as not to interfere with the tension of the driving belt when the separator is tilted which arrangement also enables the separator to be tilted while it is working, by means of the hand'wheel 12. The annular separator illustrated has two magnetic fields, each comprising two zones2/6, 3/7 and 4/7, 5/6. In order to allow of regulating the strength of the fields the annular magnet 8 may be made adjustable in a vertical plane on its axis 13. To adjust the different zones the pole pieces 2, 3, 4, 5 may be moved vertically. The knife edges 6, 7 might also be arranged on separate pole pieces adjustably attached to the magnet 8.

The operation of the separator is as follows into the magnetic fields formed by the knife edges 6, 7 and the pole pieces 2, 3. The most strongly magnetic ore is attracted into the zon 2, 6 and the weaker magnetic ore into the zone 3, 7. The mixture of raw material remaining on the table then passes into the magnetic field formed by the knife edges 6 and 7 and the pole pieces a and 5 in which suchwveakly magnetic material as is still present, is separated into two kinds in the zones 4/7 and 5/6. The magnetic particles attracted by the knife edges 6, 7 are carried out of the magnetic fields by the revolving magnet 8 and are then collected separately, while the non-magnetic material passes on through the separator on the shaking table 9 and falls off at the end.

In order to enable the magnetic material which has fallen off the annular magnet 8 to be carried away at a speed which is about equal to that of the non-magnetic material, the chutes for carrying away the magnetic material are built on to the table 9 as shown in Fig. 2, the said chutes are compelled to follow every change in the position or tilt of the table 9. When the annular magnet rotates I in the direction of the arrowm the magnetic materials separated in the zones 2/6, 3/7, 4/7 and 5/6 and'carried away by the annular magnets are correspondingly collected by the chutes 15, 16, 17 18 and pass off therein in a direction parallel to the non-magnetic material. By the aforesaid combination of th chutes 15, 16, 17, 18 with the table 9 a convenient survey over the material in its various degrees of separation as it is moving away is provided, so that in the event of defective separation suitable measures may at once be taken.

In the position shown in'Fig. 1 the table 9 is shown horizontal. If however the speed of the material on the table and in the chutes is to be increased, the table is tilted in the direction in which the material travels. The chutes 19 take up the weakest magnetic particles which are the first to fall from the annular magnets.

I claim: 1

A magnetic separator comprising in combination, a support, a substantially vertical shaft carried in said support, an annular magnet on said shaft, a plurality of stationary lower poles on said support underneath said magnet, a substantially horizontal driving shaft in gear with the lower end of said vertical shaft, a conveyor on said support intermediate said magnet and said poles and means for tilting said support about said horizontal shaft.

In testimony whereof I affix my signature.

GEORG ULLRICH. 

